iPhone backup password is encrytped with forgotten password? Or iTunes asking password repeatedly though you never set such an encryption password. Don't de confused, iTunes backup password recovery is able to unlock your forgotten password for iTunes backup.

1. How to Get Encrypted Back Up
Restore Password for iPhone 4S
Tenorshare iTunes Backup Password Recovery
http://www.windowspasswordsrecovery.com/product/iphone-backup-
unlocker.htm

2. Forgot iPhone backup password?
Lost password for iTunes backup?
iTunes asking for password repeatedly even you never
remember you set one for that?
Get the messages “Enter your password to unlock
iTunes backup” when restoring?

3. Don’t be depressed! We have iTunes backup password recovery to
recover the forgotten password!

4. It is easy to perform the iTunes backup password recovery tool – Three simple
steps:
Step 1: Import encrypted iTunes backup to this program
Step 2: Choose a proper attack mode accordingly and set the settings
Step 3: Start to unlock the password for iPhone backup
Detailed guide: http://www.windowspasswordsrecovery.com/guide/iphone-
backup-unlocker.html